[Bug 242189] ZFS filesystems are not mounted from ATA on startup due to rc <-> kernel race if root is on NVMe

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242189

            Bug ID: 242189
           Summary: ZFS filesystems are not mounted from ATA on startup
                    due to rc <-> kernel race if root is on NVMe
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: bugs at FreeBSD.org
          Reporter: osidorkin at gmail.com

Looks like root_hold_wait should be added to /etc/rc.d/zfs script after
r355010.

If root is on NVMe and e.g. /var/db is on ZFS on top of ATA then root gets
mounted and /etc/rc.d/zfs get started before ata bus scan completed.  System
boots with ZFS filesystems unmounted. There is root_hold_wait calls in
/etc/rc.d/mountcritlocal, but zfs filesystems are not mentioned in fstab.

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